IT34468: SIMPLIFY HTTP RETRY

APAR status

• Closed as new function.

Error description

• It is common for network connections to be terminated,
  especially in containers based solutions where backends may be
  elastically scaled to meet capacity. In this case it would
  improve the ability for flow to tolerate intermittent failure
  if the HTTPRequest node were able to make a single inline retry
  attempt if it encountered a broken connection when trying to
  write to a cached socket.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of App Connect Enterprise V11.0 and V12.0 using
  HTTPRequest Nodes.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  <span style="background-color:rgb(255, 255, 255)">It is common
  for network connections to be terminated, </span><span
  style="background-color:rgb(255, 255, 255)">especially in
  containers based solutions where backends may be </span>
  <span style="background-color:rgb(255, 255, 255)">elastically
  scaled to meet capacity. In this case it would </span><span
  style="background-color:rgb(255, 255, 255)">improve the ability
  for flow to tolerate intermittent failure </span><span
  style="background-color:rgb(255, 255, 255)">if the HTTPRequest
  node were able to make a single inline retry </span><span
  style="background-color:rgb(255, 255, 255)">attempt if it
  encountered a broken connection when trying to </span><span
  style="background-color:rgb(255, 255, 255)">write to a cached
  socket.           </span>
  

Problem conclusion

• If the HTTP Request node makes a request using a cached socket
  and it either fails to write to the socket or fails to read at
  least 1 byte from the socket then the HTTPRequest node will make
  another attempt using a new socket provided that no more than
  half of the allowed timeout has passed. The timeout for the
  second request is adjusted to take account of any time spent in
  the first attempt.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v11.0      11.0.0.20
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  APP CONNECT ENT

• Fixed component ID

  5724J0550

Applicable component levels